The turbines seen from Lights Beach, 3.5km west of the windfarm. Wind velocity increases as it moves up the cliffs, and the turbines benefit from this enhanced windspeed.
Cutaway of a typical direct-drive wind turbine. These machines have no gearbox, which is a source of heat and energy losses through friction, and was a common failpoint in earlier machines. —netzeroguide.com
For the technically inclined...
Turning speed ................ Variable, 16-32 rpm
Generator ....................... Synchronous, direct-drive
Blades ............................ 22.8m, GPS, auto feathering
Rated max output .......... 800kW (each)
Cut-in windspeed .......... 2.5m/s (9km/h)
Cut-out windspeed ........ 28-34m/s (100-122 km/h)
Survival windspeed ....... 59.5m/s (214 km/h)
Stop time ....................... 1 revolution (from max rpm)
Tower ............................ 50m, steel (3 sections)
Total weight .................. ±34.5t
Height AHD ................... T1-114m, T2-108m (to base)
Working life .................. 20+ years
Denmark's turbines scaled against others in the region.